[COMMON] Get rid of "x-hack" in shell scripts

$ find . -name *.sh -print |xargs grep -l '"x'| xargs sed -i 's/"x/"/g'

The "x-hack" is a historical workaround for some old UNIX shells with
buggy condition comparison code. None of them is still used today.
Recent POSIX specifications now guarantee it should work without it
in any modern POSIX shell.

More details at
https://www.vidarholen.net/contents/blog/?p=1035
https://github.com/koalaman/shellcheck/wiki/SC2268

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: Ic01bbc5faee9492dba5b5d4dea0f659540da2c24
diff --git a/kubernetes/appc/resources/config/appc/opt/onap/appc/bin/startODL.sh b/kubernetes/appc/resources/config/appc/opt/onap/appc/bin/startODL.sh
index 717ea66..68b50e1 100755
--- a/kubernetes/appc/resources/config/appc/opt/onap/appc/bin/startODL.sh
+++ b/kubernetes/appc/resources/config/appc/opt/onap/appc/bin/startODL.sh
@@ -83,7 +83,7 @@
 show databases like 'sdnctl';
 END
 )
-        if [ "x${sdnc_db_exists}" = "x" ]
+        if [ "${sdnc_db_exists}" = "" ]
         then
             echo "Installing SDNC database"
             ${SDNC_HOME}/bin/installSdncDb.sh
@@ -92,7 +92,7 @@
 show databases like 'appcctl';
 END
 )
-            if [ "x${appc_db_exists}" = "x" ]
+            if [ "${appc_db_exists}" = "" ]
             then
               echo "Installing APPC database"
               ${APPC_HOME}/bin/installAppcDb.sh
diff --git a/kubernetes/so/resources/config/docker-files/scripts/start-jboss-server.sh b/kubernetes/so/resources/config/docker-files/scripts/start-jboss-server.sh
index 52ba27d..3a9ef84 100755
--- a/kubernetes/so/resources/config/docker-files/scripts/start-jboss-server.sh
+++ b/kubernetes/so/resources/config/docker-files/scripts/start-jboss-server.sh
@@ -37,7 +37,7 @@
 trap "kill -QUIT $JBOSS_PID" QUIT
 trap "kill -PIPE $JBOSS_PID" PIPE
 trap "kill -TERM $JBOSS_PID" TERM
-if [ "x$JBOSS_PIDFILE" != "x" ]; then
+if [ "$JBOSS_PIDFILE" != "" ]; then
   echo $JBOSS_PID > $JBOSS_PIDFILE
 fi
 # Wait until the background process exits
@@ -60,6 +60,6 @@
       # Wait for a complete shudown
       wait $JBOSS_PID 2>/dev/null
 fi
-if [ "x$JBOSS_PIDFILE" != "x" ]; then
+if [ "$JBOSS_PIDFILE" != "" ]; then
       grep "$JBOSS_PID" $JBOSS_PIDFILE && rm $JBOSS_PIDFILE
 fi